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Path: utzoo!watmath!clyde!burl!ulysses!bellcore!decvax!cca!inmet!bhyde
From: bhyde@inmet.UUCP
Newsgroups: net.micro.mac
Subject: Re: bug in FillPoly?
Message-ID: <26700051@inmet.UUCP>
Date: Wed, 5-Feb-86 16:40:00 EST
Article-I.D.: inmet.26700051
Posted: Wed Feb  5 16:40:00 1986
Date-Received: Tue, 11-Feb-86 07:25:24 EST
References: <664@harvard.UUCP>
Lines: 12
Nf-ID: #R:harvard:-66400:inmet:26700051:000:639
Nf-From: inmet!bhyde    Feb  5 16:40:00 1986


Regions are encoded in bands, each band is a horz. strip across the
"screen."  A band consists has no changes in the vertical direction,
i.e. it could be drawn with a set of rectangles each one the hieght of
the band.  If you draw a diagional or curved line then region will
consist of a band for every line.  One way to approach the problems
this introduces is to "clip" the polygon to the "ulitimate" display
clipping rectangle.  Not a lot of help.  
  The region encoding is (quite clearly) not documented.  Apple can
change it.  I imagine that a hardward assisted quickdraw would be a
likly reason to change it.
   ben hyde, cambridge